单项选择题

The government calls on young persons' __________ service to the national defense.

A．valuable
B．passionate
C．virtual
D．voluntary
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单项选择题
My car is always breaking down, but I don't know enough about __________ to be able to fix it my self.
A．mechanics
B．mechanism
C．mechanic
D．medicine
单项选择题
A new system of quality control was __________ to overcome the defects in the firm's products.
A．invested
B．installed
C．introduced
D．instructed
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